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Impact of maize hormonal interactions on the performance of Spodoptera frugiperda in plants infected with Clavibacter michiganensis subsp. nebraskensis
Arthropod-Plant Interactions ( IF 1.6 ) Pub Date : 2021-06-28 , DOI: 10.1007/s11829-021-09849-x
Karen F. Da Silva , Sydney E. Everhart , Joe Louis

In nature, plants interact with multiple organisms, below and aboveground. Although interactions of plants with single biotic stressors are well characterized, knowledge of how the immune system responds to multiple biotic stressors is lacking. It is known that the two most important pathways involved in the plant immune defenses are jasmonic acid (JA) and salicylic acid (SA). The crosstalk between these plant hormonal signaling pathways seems to fine-tune the plant responses to different stressors. In this study, we characterized maize (Zea mays) hormonal interactions under the attack of two economically important pests: the bacterial pathogen that causes Goss’s bacterial wilt and leaf blight (Clavibacter michiganensis subsp. nebraskensis), and the chewing insect, fall armyworm (Spodoptera frugiperda). Our results indicate that the Goss’s wilt-resistant maize plants when pretreated with bacteria became more vulnerable to the subsequent attack by the fall armyworm larvae. Furthermore, plant hormone analysis demonstrated that the antagonistic interactions of JA-Isoleucine (JA-Ile), biologically active form of JA, and SA in maize plants contributed to enhanced plant susceptibility to herbivory. Collectively, our results suggest that plant hormonal interactions may play a major role in maize defense against multiple biotic stressors. Furthermore, this study will improve our understanding and ability to predict plant-induced hormone responses in an economically important crop.



中文翻译:

玉米激素相互作用对 Spodoptera frugiperda 在感染 Clavibacter michiganensis subsp. 的植物中的表现的影响。内布拉斯加州

在自然界中,植物与地下和地上的多种生物相互作用。尽管植物与单一生物应激物的相互作用已得到很好的表征,但缺乏免疫系统如何对多种生物应激物作出反应的知识。众所周知,参与植物免疫防御的两个最重要的途径是茉莉酸 (JA) 和水杨酸 (SA)。这些植物激素信号通路之间的串扰似乎可以微调植物对不同压力源的反应。在这项研究中,我们描述了玉米 ( Zea mays ) 在两种重要经济害虫的攻击下的激素相互作用:导致 Goss 青枯病和叶枯病的细菌病原体(Clavibacter michiganensis subsp. nebraskensis)),还有咀嚼昆虫,秋粘虫 ( Spodoptera frugiperda )。我们的结果表明,经过细菌预处理的 Goss 抗枯萎玉米植株变得更容易受到秋季粘虫幼虫的后续攻击。此外,植物激素分析表明,玉米植物中 JA-异亮氨酸 (JA-Ile)、生物活性形式 JA 和 SA 的拮抗相互作用有助于增强植物对食草的敏感性。总的来说,我们的结果表明,植物激素相互作用可能在玉米抵御多种生物胁迫的过程中发挥重要作用。此外,这项研究将提高我们对具有重要经济意义的作物的植物诱导激素反应的理解和能力。

更新日期:2021-06-29
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